A composite pipe for hydrogen production in the ground and a system thereof

Abstract

The application discloses a kind of composite pipeline for hydrogen production underground and system thereof, belong to hydrogen production equipment field underground.This application uses the technical scheme, a kind of composite pipeline for hydrogen production underground, including pipeline body and the sealing connector for connecting two groups of pipeline body end, sealing connector includes sealing ring, sealing ring inner diameter is matched with the outer diameter of pipeline body, sealing ring outer wall is equipped with sealing box, and sealing box is equipped with elastic air bag, and multiple groups of gas ducts are equipped on elastic air bag, and gas duct is arranged through sealing ring, sealing ring outer wall is equipped with fastener, and fastener is used to make sealing ring and pipeline body closely adhere;The application can solve when hydrogen high-pressure storage tank is used to output hydrogen on the switch of connecting pipe or high-pressure storage tank stops running due to fault, hydrogen in pipeline body continues to discharge due to inertia, the problem that the gas pressure in pipeline body decreases, and there is gas pressure difference between external atmospheric pressure and pipeline body.

Description

Technical Field

[0001] This invention belongs to the technical field of underground hydrogen production equipment, specifically relating to a composite pipeline and system for underground hydrogen production. Background Technology

[0002] In the hydrogen energy industry chain, the four most important links are hydrogen production, hydrogen storage, hydrogen transportation, and hydrogen utilization. Among them, hydrogen transportation is an important link in the hydrogen energy industry chain, and pipelines are an important economic means to achieve large-scale, long-distance transportation.

[0003] Currently, medium-pressure / high-pressure pipelines are commonly used for hydrogen transportation, and these are typically dedicated lines. Seamless metal pipes are commonly used for hydrogen transportation, generally seamless stainless steel. Specific pipeline steel materials suitable for hydrogen pipelines include X42, X52, X56, X60, X70, and X80. However, alloying elements such as C, Mn, and Cr can enhance the hydrogen embrittlement sensitivity of low-alloy steels. Furthermore, the higher the hydrogen pressure and the higher the material strength, the more pronounced the hydrogen embrittlement and hydrogen-induced cracking phenomena become. In addition, Monel alloys are used to produce hydrogen pipelines due to their excellent physical properties of high strength, high corrosion resistance, and wear resistance. However, for long-distance hydrogen transportation, the technology using Monel alloy pipelines is complex, the cost is too high, and mass production is difficult.

[0004] In the prior art, the invention patent with application number CN202210315029.3 discloses a composite pipe structure, including a plastic pipe, a polyurethane foam layer and a plastic protective layer. From the inside to the outside, the structure consists of a plastic pipe, a polyurethane foam layer and a plastic protective layer, which has excellent physical properties such as low cost, high strength, high corrosion resistance and wear resistance.

[0005] However, the application still has the following shortcomings: when the gas transmission equipment stops transmitting gas, the gas in the pipeline continues to be discharged due to inertia. At this time, the internal pressure of the pipeline will decrease, and the external atmospheric pressure will crush the pipeline wall. Over time, this will accelerate the damage to the pipeline. Summary of the Invention

[0006] The present invention provides a solution to at least one of the above-mentioned technical problems.

[0007] The technical solution adopted in this invention is as follows:

[0008] A composite pipeline for underground hydrogen production includes a pipeline body and a sealing connector for connecting the ends of two sets of pipeline bodies. The sealing connector includes a sealing ring with an inner diameter matching the outer diameter of the pipeline body. A sealing housing is provided on the outer wall of the sealing ring, and an elastic gasbag is provided inside the sealing housing. Multiple gas guide tubes are provided on the elastic gasbag, and the gas guide tubes penetrate the sealing ring. Fasteners are provided on the outer wall of the sealing ring to ensure a tight fit between the sealing ring and the pipeline body. The gas guide tubes are inserted into the inner cavity of the pipeline body along the connection seam between the two sets of pipeline bodies. The sealing ring is pressed together by the fasteners to achieve the connection and fixation of adjacent pipeline bodies. The sealing housing, elastic gasbag, and gas guide tubes are used to secure the connection. The design of the pipe can solve the problem of hydrogen continuing to escape from the pipeline body due to inertia when the switch on the connecting pipe used by the high-pressure hydrogen storage tank to output hydrogen is closed or the high-pressure storage tank is shut down due to a malfunction. This causes a decrease in gas pressure inside the pipeline body and a pressure difference between the external atmospheric pressure and the gas inside the pipeline body. When the switch on the connecting pipe used by the high-pressure hydrogen storage tank to output hydrogen is closed or the high-pressure storage tank is shut down due to a malfunction, as the gas pressure inside the pipeline body decreases, the hydrogen stored in the elastic bladder enters the pipeline body along the gas guide pipe, balancing the pressure difference caused by the hydrogen escaping from the pipeline body. This prevents the pipeline body from being crushed by external pressure and increases the service life of the pipeline body.

[0009] To optimize the performance of the pipe body and increase its service life, preferably, the pipe body is a composite pipe, and the composite pipe wall material consists of a ceramic pipe, a polyurethane foam layer, and a plastic protective layer from the inside out.

[0010] To further optimize the performance of the pipe body and increase its service life, preferably, the polyurethane foam layer is prepared by mixed foaming of polyMDI and polyether, and the thickness of the polyurethane foam layer is between 4-10mm. The plastic protective layer is made of high-density polyethylene material, and the thickness of the plastic protective layer is between 2-7mm.

[0011] To facilitate fixing the sealing ring to the pipe body, preferably, the fastener is an annular clamp, and the two ends of the annular clamp are fastened together with bolts.

[0012] To increase the airtightness of the connection between the sealing ring and the pipe body and prevent hydrogen leakage, preferably, both ends of the pipe body are provided with grooves for connecting the sealing ring, and the outer wall of the groove is provided with multiple closed sealing grooves for placing the sealing rubber ring.

[0013] To facilitate the insertion of the air guide tube into the interior of the pipe body and to optimize the gap between the two pipe body joints, preferably, multiple sets of slots for engaging the air guide tube are provided at the same positions on both ends of the pipe body, with the number and position of the slots matching the air guide tube.

[0014] To increase hydrogen transport efficiency, preferably, the axial cross-section of the ceramic pipe is designed to first contract and then expand.

[0015] In order to monitor the pressure, temperature, hydrogen flow rate, flow rate and concentration inside the pipeline in real time, preferably, a data monitoring device is also included. The data monitoring device is used to monitor the pressure, flow rate, temperature and hydrogen concentration inside the pipeline. The data monitoring device is located inside the sealing ring, and the probe of the data monitoring device is inserted into the interior of the pipeline through a slot.

[0016] To facilitate the support and fixation of the sealed enclosure, preferably, a support frame is provided on the side wall of the sealed enclosure.

[0017] An underground hydrogen production system includes the aforementioned composite pipeline, as well as a hydrogen production tank, a filter box, and a compression tank. The bottom of the hydrogen production tank is equipped with a liquid delivery pipeline for adding raw material liquid into the tank. A first pump is installed on the liquid delivery pipeline. A first gas delivery pipeline connects the upper end of the hydrogen production tank to the filter box, and a second pump is installed on the first gas delivery pipeline. A second gas delivery pipeline connects the filter box and the compression tank. The filter box contains a semi-permeable membrane for filtering hydrogen. Only hydrogen gas in the mixed gas entering the filter box can pass through the semi-permeable membrane and enter the compression tank for compression and storage along the second gas delivery pipeline. An output pipeline is located at the upper end of the compression tank, and a valve is installed on the output pipeline. The end of the output pipeline furthest from the compression tank is connected to the pipeline body via a sealing connector.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows:

[0019] 1. This invention can solve the problem that when the switch on the connecting pipe used to output hydrogen from the high-pressure hydrogen storage tank is closed or the high-pressure storage tank is shut down due to a malfunction, the hydrogen in the pipeline body continues to be discharged due to inertia, the gas pressure inside the pipeline body decreases, and there is a pressure difference between the external atmospheric pressure and the gas pressure inside the pipeline body.

[0020] 2. In a preferred embodiment of the present invention, when the switch on the connecting pipe of the high-pressure hydrogen storage tank for outputting hydrogen is closed or the high-pressure storage tank is shut down due to a malfunction, as the gas pressure inside the pipeline body decreases, the hydrogen stored in the elastic bladder enters the pipeline body along the gas guide pipe, balancing the pressure difference caused by the discharge of hydrogen inside the pipeline body, preventing the pipeline body from being crushed by external pressure, and increasing the service life of the pipeline body.

[0021] 3. In a preferred embodiment of the present invention, the sealing ring is pressed by a fastener, which is an annular clamp. The two ends of the annular clamp are fastened together by bolts. Tightening the bolts increases the pressure of the annular clamp on the sealing ring, so that the inner diameter of the sealing ring is tightly fitted with the outer diameter of the pipe body. The setting of the sealing groove and the sealing rubber ring helps to increase the airtightness at the joint between the inner wall of the sealing ring and the outer wall of the pipe body, and avoids hydrogen leakage. Attached Figure Description

[0022] Figure 1 This is one of the structural schematic diagrams of a specific embodiment of the present invention;

[0023] Figure 2 For the present invention Figure 1 Enlarged view of section A in the middle;

[0024] Figure 3 This is a second structural schematic diagram of a specific embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the underground hydrogen production system in a specific embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the slot, groove, and sealing groove structure in a specific embodiment of the present invention.

[0027] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0028] In the attached diagram:

[0029] 1. Pipeline body; 101. Ceramic pipe; 102. Polyurethane foam layer; 103. Plastic protective layer; 104. Slot; 105. Sealing groove; 2. Sealing ring; 201. Fastener; 3. Sealing box; 301. Elastic airbag; 302. Gas guide pipe; 303. Support frame; 4. Data monitoring device; 5. Sealing rubber ring; 6. Hydrogen production tank; 601. Liquid delivery pipeline; 602. First gas delivery pipeline; 7. First pump; 8. Second pump; 9. Filter box; 10. Second gas delivery pipeline; 11. Compression tank; 12. Output pipeline; 121. Valve. Detailed Implementation

[0030] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0032] Furthermore, in the description of this invention, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," "specific example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Example 1:

[0036] Reference Figure 1-5A composite pipeline for underground hydrogen production includes a pipeline body 1 and a sealing connector for connecting the ends of two sets of pipeline bodies 1. The sealing connector includes a sealing ring 2, the inner diameter of which matches the outer diameter of the pipeline body 1. A sealing box 3 is provided on the outer wall of the sealing ring 2, and an elastic airbag 301 is provided inside the sealing box 3. Multiple sets of gas guide pipes 302 are provided on the elastic airbag 301, and the gas guide pipes 302 penetrate the sealing ring 2. Fasteners 201 are provided on the outer wall of the sealing ring 2 to ensure a tight fit between the sealing ring 2 and the pipeline body 1. The gas guide pipes 302 are inserted into the inner cavity of the pipeline body 1 along the connection seam between the two sets of pipeline bodies 1. When workers install the pipeline body 1, the sealing connector... To install two adjacent pipe bodies 1, first, connect the pipe body 1 to the hydrogen high-pressure storage tank's hydrogen output pipe using a sealing connector. When the length of one pipe body 1 is insufficient, multiple pipe bodies 1 can be spliced ​​together. The splicing method involves aligning the joint ends of two adjacent pipe bodies 1, then fitting a sealing ring 2 between the two pipe bodies 1. The sealing ring 2 is then tightened using fasteners 201, which are annular clamps. The two ends of the annular clamp are bolted together. Tightening the bolts increases the pressure of the annular clamp on the sealing ring 2, ensuring a tight fit between the inner diameter of the sealing ring 2 and the outer diameter of the pipe body 1. It is important to note that the two pipe bodies 1... When splicing the joint, a reserved opening needs to be reserved for connecting the gas guide tube 302. The gas to be transported in the pipe body 1 can enter the gas guide tube 302 through the reserved opening. Specifically, multiple sets of slots 104 for engaging the gas guide tube 302 are provided at the same positions on both ends of the pipe body 1. The number and position of the slots 104 match the gas guide tube 302. The gas then enters the elastic airbag 301 along the gas guide tube 302. After the pipe body 1 is installed and connected and ventilated, during the transportation process, a portion of the hydrogen in the pipe body 1 enters the elastic airbag 301 along the gas guide tube 302. The elastic airbag 301 will inflate after being filled with hydrogen and adhere to the inner wall of the sealed box 3. The setting of the sealed box 3 is advantageous. To limit the expansion of the elastic airbag 301 and prevent it from over-expanding, when the switch on the connecting pipe for hydrogen output from the high-pressure hydrogen storage tank is closed or the high-pressure storage tank stops operating due to a malfunction, the hydrogen in the pipeline body 1 continues to be discharged due to inertia, and the gas pressure in the pipeline body 1 decreases. As the gas pressure in the pipeline body 1 decreases, the hydrogen stored in the elastic airbag 301 enters the interior of the pipeline body 1 along the gas guide pipe 302, balancing the pressure difference caused by the discharge of hydrogen in the pipeline body 1, preventing the pipeline body 1 from being crushed by external pressure, and increasing the service life of the pipeline body 1. The side wall of the sealing box 3 is provided with a support frame 303, which can fix and support the pipeline body 1 and the sealing box 3.

[0037] Furthermore, both ends of the pipe body 1 are provided with slots for connecting the sealing ring 2. The outer wall of the slot is provided with multiple closed sealing grooves 105. The sealing grooves 105 are used to place the sealing rubber ring 5. The setting of the sealing grooves 105 and the sealing rubber ring 5 helps to increase the airtightness at the connection between the inner wall of the sealing ring 2 and the outer wall of the pipe body 1, and avoid hydrogen leakage.

[0038] Furthermore, the pipe body 1 is a composite pipe. The composite pipe wall material, from the inside out, consists of a ceramic pipe 101, a polyurethane foam layer 102, and a plastic protective layer 103. The thickness of the plastic protective layer 103 is between 2-7 mm. The ceramic pipe 101 has excellent corrosion resistance, which can effectively prevent the corrosion of the inner wall of the pipe body 1 by the small amount of acidic gas mixed in the hydrogen. Moreover, the ceramic material has low frictional resistance and also has excellent antistatic properties, which increases the safety during hydrogen transportation. The polyurethane foam layer 102 is prepared by mixed foaming of polyMDI and polyether. The polyurethane foam layer 102 has excellent waterproof, heat insulation and buffering functions. The thickness of the polyurethane foam layer 102 is between 4-10 mm. The plastic protective layer 103 is made of high-density polyethylene material, which further increases the strength and service life of the pipe body 1.

[0039] Example 2:

[0040] Reference Figure 1-2 Similar to Example 1, but further, the axial cross section of the ceramic pipe 101 is first contracted and then expanded. When hydrogen passes through the ceramic pipe 101, it is first compressed. During the compression process, the flow rate of hydrogen increases. During this process, there is an energy conversion from the internal energy of hydrogen to kinetic energy. Therefore, the temperature of hydrogen will decrease during the compression process, which can suppress the gas temperature rise and expansion during hydrogen transportation to a certain extent, and further increase the hydrogen transportation efficiency.

[0041] Example 3:

[0042] Reference Figure 1 Similar to Embodiment 1, but further, it also includes a data monitoring device 4. The data monitoring device 4 is used to monitor the pressure, flow rate, temperature and hydrogen concentration inside the pipeline body 1. The data monitoring device 4 is located inside the sealing ring 2. The probe of the data monitoring device 4 is penetrated into the interior of the pipeline body 1 through the slot 104. It should be noted that the data monitoring device 4 in the above embodiment is a mature prior art, and no specific model is limited here.

[0043] Example 4:

[0044] Reference Figure 1-4Similar to Example 1, but further, an underground hydrogen production system includes a composite pipeline, a hydrogen production tank 6, a filter box 9, and a compression tank 11. The bottom of the hydrogen production tank 6 is provided with a liquid delivery pipeline 601 for adding raw material liquid into the hydrogen production tank 6. A first pump 7 is provided on the liquid delivery pipeline 601. A first gas delivery pipeline 602 is connected between the upper end of the hydrogen production tank 6 and the filter box 9. A second pump 8 is provided on the first gas delivery pipeline 602. A second gas delivery pipeline 10 is connected between the filter box 9 and the compression tank 11. A semi-permeable membrane for filtering hydrogen is provided inside the filter box 9. Only hydrogen in the mixed gas entering the filter box 9 can pass through the semi-permeable membrane and enter the compression tank 11 for compression and storage along the second gas delivery pipeline 10. An output pipeline 12 is provided at the upper end of the compression tank 11. A valve 121 is provided on the output pipeline 12. The end of the output pipeline 12 away from the compression tank 11 is connected to the pipeline body 1 through a sealing connector.

[0045] This invention solves the problem that when the switch on the connecting pipe for hydrogen output from the high-pressure hydrogen storage tank is closed or the high-pressure storage tank is shut down due to a malfunction, the hydrogen in the pipeline body 1 continues to discharge due to inertia, causing a decrease in the gas pressure inside the pipeline body 1 and a pressure difference between the external atmospheric pressure and the gas pressure inside the pipeline body 1. When the switch on the connecting pipe for hydrogen output from the high-pressure hydrogen storage tank is closed or the high-pressure storage tank is shut down due to a malfunction, as the gas pressure inside the pipeline body 1 decreases, the hydrogen stored in the elastic air bladder 301 enters the interior of the pipeline body 1 along the gas guide pipe 302, balancing the pressure difference caused by the discharge of hydrogen inside the pipeline body 1, preventing the pipeline body 1 from being crushed by external pressure, and increasing the service life of the pipeline body 1.

[0046] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0047] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0048] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A composite pipe for hydrogen production in the ground, comprising pipe bodies and sealing connectors for connecting the end portions of two groups of pipe bodies, characterized in that, The sealing connector comprises a sealing ring, the inner diameter of the sealing ring matches the outer diameter of the pipeline body, the outer wall of the sealing ring is provided with a sealing box, the sealing box is provided with an elastic air bag, a plurality of air guide pipes are arranged on the elastic air bag, the air guide pipes penetrate through the sealing ring, the outer wall of the sealing ring is provided with a fastener, the fastener is used to tightly attach the sealing ring to the pipeline body, and the air guide pipes are connected to the inner cavity of the pipeline body along the joint of the two pipeline bodies. The fastener is a ring-shaped clamp, and the two ends of the ring-shaped clamp are fastened and connected by bolts. The pipeline body is provided with a notch at each end for connecting the sealing ring, the outer wall of the notch is provided with a plurality of closed sealing grooves for placing the sealing rubber ring. A plurality of clamping grooves for clamping the air guide pipes are arranged at the same position of the two ports of the pipeline body, and the number and position of the clamping grooves match those of the air guide pipes.

2. The composite pipe for hydrogen production in the ground according to claim 1, wherein The pipeline body is a composite pipeline, and the wall material of the composite pipeline is sequentially composed of a ceramic pipeline, a polyurethane foaming layer and a plastic protective layer from inside to outside.

3. The composite pipe for hydrogen production in the ground according to claim 2, wherein The polyurethane foaming layer is prepared by mixing and foaming poly MDI and polyether, the thickness of the polyurethane foaming layer is between 4-10 mm, the plastic protective layer is a high-density polyethylene material, and the thickness of the plastic protective layer is between 2-7 mm.

4. The composite pipe for hydrogen production in the ground according to claim 2, wherein The axial section of the ceramic pipeline is first contracted and then expanded.

5. The composite pipe for hydrogen production in the ground according to claim 4, wherein A data monitoring device is further included, which is used to monitor the pressure, flow, temperature and hydrogen concentration in the pipeline body, the data monitoring device is arranged on the inner side of the sealing ring, and the probe of the data monitoring device penetrates into the pipeline body through the clamping groove.

6. The composite pipe for hydrogen production in the ground according to claim 1, wherein The side wall of the sealing box is provided with a support frame.

7. An underground hydrogen production system characterized by, The composite pipeline according to any one of claims 1-6 further comprises a hydrogen production tank, a filter box and a compression tank, the bottom of the hydrogen production tank is provided with a liquid delivery pipeline, the liquid delivery pipeline is used to add raw material liquid into the hydrogen production tank, a first pump is arranged on the liquid delivery pipeline, a first gas delivery pipeline is connected between the upper end of the hydrogen production tank and the filter box, a second pump is arranged on the first gas delivery pipeline, a second gas delivery pipeline is connected between the filter box and the compression tank, a semi-permeable membrane for filtering hydrogen is arranged in the filter box, only hydrogen in the mixed gas entering the filter box can pass through the semi-permeable membrane and enter the compression tank along the second gas delivery pipeline for compression and storage, an output pipeline is arranged at the upper end of the compression tank, a valve is arranged on the output pipeline, and the end of the output pipeline away from the compression tank is connected to the pipeline body through a sealing connector.

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